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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808d8da8d3db23451fdbdd82123dc6c57b053e5783309478c28b0036135fd4e6' 
  AND token = 'hSFtoFl+mg6F0NtDk10/MgAKyzvoU9hPCo7LzMWxbTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}